Maria Rigou Spiros Sirmakessis Athanasios K. Tsakalidis A Computational Geometry Approach to Web Personalization. 377-380 2004 conf/wecwis/2004 CEC http://doi.ieeecomputersociety.org/10.1109/ICECT.2004.1319762 db/conf/wecwis/cec2004.html#RigouST04